COVID-19 Tracker Script Debugging

BehavioralPalantirLast reported September 2025Low Frequency
Reported
2× across candidate reports
First seen
July 2025
Last reported
September 2025
Reported outcome
unknown

Problem Overview

Given a script that implements a graph-like COVID-19 contact-tracing tracker, one of the data results produced by the script contains an error. The interviewer walks you through the code to ensure you understand it, then asks you to identify and fix the…

  • 2 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
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